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I I FURNITURE SPRING- No. 402,434. Patented Apr. 30, 1889..

. UNITED STAT S ALEXANDER MARTI-IINIUS GJESTVANG, or OIIRISTIANIA,NORWAY.

FURNITURE-SPRING.

I PATENT OFFICE.

srncrrrcArroiv forming part 6f Letters Patent No. 402,434, dated April30, 1889.

, Application filed February 23, 1888. erial 110. 265,077. (No model.)Patented in Norway January 3, 1888, No. 778 i in Sweden January 31,1888, No.1,898; in England May 11, 1888, No. 7,052, and in France June4,1888,N0.190,995-

To all whom-it matg concerm Be it known that I, ALEXANDER MARTHI- NIUsGJESTVANG, a citizen of Norway, residing at Oh ristiania, Norway, haveinvented certain new and useful Improvements in Furniture-Springs, (forwhich I have obtained Letters Patent in the following countries, to wit:Norway, January 3, 1888, No. 7 7 3; Sweden, January 31, 1888, No. 1,399;England, May 11, 1888, No. No. 7,052, and France June 4, 1888,No.190,'995;) and I do hereby declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, and to letters orfigures of reference marked thereon, which form a part of thisspecification.

The" invention relates to, that class of springs more especially adaptedfor use in chairs and upholstered furniture 5' and it consists instructural features and in the combination, with the spring, ofretaining devices to secure such spring in position for use.

The object of my. invention is to provide a strong yet elastic oryielding spring for chairs and the like, and a simple and efficientmeans for securing the springs in position for use.

Referring to the drawings, Figures 1, 2, and 3 are detail views ofdifferent forms of springarms detached or separated from the springshown in Fig. 5. Fig. 4 is an isometric view of the two halves of thefastening device, and Fig. 5 is a plan view showing the spring connectedwith its support or retaining devices.

The spring consists, essentially, of a plurality of radially-arrangedspring-arms formed of a single wire, and in Fig. 1 I have shown one ofthe arms in its simplest form, the wire A being doubled and bent into orsubstantially into a half-ellipse, the upper bent portion, a,constituting the spring-bearing, while the diverging branches 0, serveto secure the spring to the retaing devices.

According to the degree of elasticity the spring is to. have, and alsoto some extent according to the degree of resistance it is to offer topressure exerted thereon, I form in each branch of the wire portion A ofwhich the arms are formed, at the smallerend of the half-ellipse, one ormore convolutions, a

volutions a in the diverging branches of the wire A, as shown in Fig. 3.In practice I preferably form a plurality of convolutions at the pointsnamed for the purposes stated.

- The spring when applied to a chair is arranged with its arms in radialplanes, so that their free ends or bearings will converge toward acommon center. This may be done in a very simple and effective manner bymeans of the retaining plates or disks B and 0, (shown in Fig. 4,) forinstance. The plate 0 is provided with projections c, bounded by tworadial lines, said projections decreasing in width from the peripherytoward the axis of the disk or plate. The plate B, on the contrary, isprovided with recesses 1), into which said projections fit.

The branches a of each arm-section of the spring are laid on oppositesides of the pro-- j ections c on the plate or disk 0, Z and the plateor disk B is placed thereon so that its recesses 19 will register withthe project-ions c on disk 0, and the whole'may then be firmly securedtogether by a single axial bolt, D.

'Of course the system of spring described may be applied to upholsteredfurniture in general, as well as to spring-mattresses, and for thelatter purpose the free end a of the spring arms or sections may bemoved to come close together at a point in the vertical plane of theaxis of the retaining-bolt and above the latter.

It will be observed that with a construction of spring such as describeda strong durable spring may be produced very cheaply, and thatanydesired degree of elasticity may be given to such a spring.

Having described my invention, what I claim, and desire to secure byLetters Patent, 1S v l 1. A spring cOnsistingfl. a plurality ofspring-arms bent into or substantially into the form of a half-econverge toward a ..,c being constructed oi' s ugle wire, substantiallyas describe 2. A spring consisting of spring-arms converging toward acommon center, each spring-arm comprising two members or branches bentinto or substantially into the fpmn of a half-ellipse, and having one ormore convolutions formed in the mem- .bers thereof at a point or pointsintermediate of the extremes of such branches, substantially as and forthe purposes specified.

3. A spring consisting of a plurality of spring-arms converging toward acommon center, each spring-arm comprising two members or branches bentinto or substantially into the form of a half-ellipse, and having one ormore convolutions formed in the members thereof at a point or pointsintermediate of the extremes of such arms, said spring being made of asingle or continuous wire,

ALEXANDER MARTHINIUS GJESTVANG.

Witnesses:

OSCAR WINGE, FRED. HERMAN GADE.

